Exhaust heater



Jan. 7, 1930. H. P. RENWICK 1,742,873

EXHAUST HEATER Filed Jan. 6. 1928 HWM'HJEIHMMMHMIW HE ZM ZP. 733 014360 Patented Jan. 7, 1930 UNITED STATES PATENT OFFICE HERBERT 1?. RENWICK, OF CHICAGO, ILLINOIS, ASSIGNOR TO STAR SPECIALTY MFG. COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS EXHAUST HEATER Application filed January 6, 1928. Serial No. 244,822.

The invention relates generally to exhaust heaters for automotive vehicles of the type wherein air is conducted through a casing which surrounds a portion of the exhaust pipe of the engine and is passed on into the body of 5 .the vehicle.

It is the primary object of the present invention to provide a novel exhaust heater of this type which may be easily installed by relatively unskilled persons and which is of such a universal character as to be adaptable for installation on exhaust pipes of different diameters.

In attaining this object I'provide a heater 5 casing of one standard size which will pro- .vide sufficient heating space when usedwith any of the sizes of exhaust pipes which are encountered in ordinary'cars and embodying adjustable means adapted to fit the casing. about any exhaust pipe within the common range of sizes.

Another object is to provide a heater of this type having a casing of uniform size adapted to surround an exhaust pipe and having means mounted on the ends thereof adapted to fit the casing upon exhaust pipes of difierent diameters.

Another object is to provide a sheet metal joint adapted to join the end of a tubular member with a smaller member which lies within a predetermined range of size.

Other objects and advantages will. become apparent from the following description and from the drawings, in which:

Figure 1 is a side elevational view of an exhaust heater embodying the preferred form of the invention.

Fig. 2 is an enlarged elevational view of a part of the heater shown inFig. 1. p

Fig. 3 is a sectional view taken along the line 3-3 of Fig. 2.

Fig. 4 is a plan view of a sheet metal blank 1 which has been stamped to form the part shown in Fig. 2, but before complete assembly thereof.

Fig. 5 is a side view of the sheet metal blan shown in Fig. 4.

Fig. 6 is an end view of the blank shown in Fig. 4 as viewed from below in Fig. 4.

'While the invention is susceptible of various modifications and alternative constructions, I have shown in the drawings and will herein describe in detail the preferred embodiment, but it is to be understood that I do not thereby intend to limit the invention to the specific form disclosed but intend to cover all modifications and alternative constructions falling within the spirit and scope of the invention as expressed in the appended claims.

The exemplary embodiment of the invention chosen'for disclosure herein is shown as having a casing 1 mountedon an exhaust pipe 2 of a motor vehicle having a floor board 3' and comprises generally a comparatively large tubular member 4 which surrounds the exhaust pipe throughout a portion of its length and is supported thereby. The tubular member 4 and the exhaust pipe 2 are preferably arranged concentrically so as to provide an annular passage 5 through which air may be conducted to be heated by contact with the exhaust pipe. The heated air is then conducted upwardly from the casing 1 by means of a suitable conduit 6 and is dis charged into the body of the vehicle through i a register 7 which is preferably mounted in the floor of the vehicle.

In the embodiment herein illustrated the air for heating the car is supplied by means of a forced draft device which cooperates with the motor fan of the vehicle to force air into the forward end of the heater casing.

ing 1 about any exhaust pipe which lies within the common range of sizes, I provide a sheet metal joint preferably mounted on the ends' of the casing and means for attaching the joint to the exhaust pipe by the use of ordinary hand tools.

bled-joint-is arranged to overlapthe end 13* 3 of the strip as shown in Fig.- 3. it-plurality of apertures 14 may be provided in the flap 12 and the end 13 to permit the two-ito be joined as by rivets 15. j

To limit the distanctw'wl'iielf the'flarge tubular membent may be inserted, an abutf meat 16 is provid d 'pfeferably""struek out from the inner of the two. overlapping-ends of? thestrip 11 and arranged toproje'ctinwardly of *the' joint *when in"assenibledposition to engage the end ofthe tube 4. In'ithepresent embodimentan, 'aprtiire 17' is alsoj'provided in the strip ll'to'rec'eive a circular "clamping casing to'thefl'exible tiibing'nieniberswhich H v y y and-which will serve efi'ectively -toconnect conduct the air to and from. the heater. To provide an inwardly convergin portion extending from the e'iid of 'the larger casing member 4to' meetthe outer surface of the smaller exhaust pi'pe 2, a plur' ality'ofsubstanti'ally' parallel *slits 19 "are 1 formed inf the sheet metalblaiilr" 10 substantially "at ri ht-.3 angles to the strip li -a-nd extendingfromsaid strip to the opposite edge of the blanki 'thus forming apluralityof strips or fingers 20.

tion 11 is wrapped around an end of the tube I n will be app'arehtthat when' 'the s'trip por' 4,'tjhe" free ends fof'the fingers may be bent in-.

"Wardly toward 3 the outer 'surf'a'ce"- of con centric pipe 2- at anac'ute an'gle t'hereto. When the fingers '20 are thus "bentfit 'will" be apparent thatth'ey'wiH ave-name farm a continuous ir'iw'ar'dl'y cohvrginganniilar'wall joining the two tubul'armefnbers. V a

Inf' order tl'i"at "-the fingers may joverlap j throughoutsubstantially their-entire length? I so as to produce practicallyari airtightjoint bet-ween the tube and pipe; alters t fingers '20 are preferably oflset'fiflwardly {from' the j plane'- of th ev'dther fingers 20 nearer Figs. 14am 5), 'Whefithealtematefin rsao are fingers 20 mayapenvergettoward eaeh "other dufingisub stanti'ally their "entire iengtlr' anw when the] 7:5 fingers 20* 'a're'lient inwardly"theiriimer sur- "faces will"contactthe'cehvergingedg s of ad-fthem entire lmgtmams roiming sweetie-i113 air tight wall. At the ends 61 th'fiiigersf" o pmisnsiaz are bane-had an Angiflar'position These e eo s 22 a1se fdrmed wflh a mlight-lyarcuate cross section (Figs14) s6 that average *sized pipeand' tote eimaped mereto.

they may be more easilylelampd'inl'position.

haust heaceewhich-ma be easily and economically applied to exhaust pipes of different diamete'r's 'ahd'which is-readily adapted to permit of installation by "an ordinary purchaser. This adapts the heater to all -n'iakes of Fears and a'voi'dsthe necessity andexpen'se of-making' and handling as-m'any si'z'esof heater as there are difi'erentsized exhaust pipes.

'It-willalso' be "apparent'that a-"coupling member-has beenprov'idedwhich is adapted to be economically formed from sheet metal two axially alined tubular ine'm'b'ers of difierntdiameters with a practically"=air' tight joint. I r lelaim as my-invention: a

1. In an-exhaust heater for automotive hicles' having apasing-arra'nged to surround a p0 of formingendfclosures for said easingabout the exhaust pipe comprising aplu'rality of fingers projecting longitudinally from Y the ends of the casing, alternate fingers being arrtion ofan exhaust pipe of; a vehicla-means ranged to be'ibe'ntinwardly toward and at an acute angle to an exhaustpi'pe so as to' leave angular -openings "between adjacent bent fingersand the other; fingers-"bent'inwardly to contact-the" edges of said' previously b'ent fingers and thereby close said openings. I 2. 'Irr anexhaust heater "having aitubular member having i inlet and-1 outlet-i openings tlierein and surrounding an 'ex'haustpipegp 7 form a heating passagey means to close the ends of'thepassagecomprising a plurality of substantially flat-fingers projecting: axially from the ends-of said member-'andadmpted to be bent Y inwardly in overlap-ping:- relation I with'ea'clr otherand to contactsaidpipe at an acute angle thereto, and means-atorsecliring saidifin'gers incontactwith said-pipe.

3. In an 'exhaust lieater having ga tubular. member haying I inlet and outlet openings formed therein, said membefibing adapted to surroundenexhaust-pipe, meansa&pting said membenfor'appl'i'oation to *pipes o f dif-, V

ferentdiameters, said fiieajr'is "comprising 2 sheet metal members attached to the'en ds 0f said "tubuler rnelnber-and having-fa 'plhrality of integrally formed fingersfidapt'ed to be bent inwardly intomodtact witli and at an acute ahgleto theouter'sih faeehf theexhaust pipe; at" fing ehmp'ior sewrin the ends iii said fingers in such contact, and means on said fingers to retain said ring clamp in position thereon.

4. A connecting device for joining two tubular members of different diameters which are substantially in axial alinement, said device comprising a band adapted to surround the end of the larger member, a plurality of fingers formed integrally with said band and extending longitudinally from the end of said tubular member, said fingers being adapted to be bent inwardly into converging and overlapping relation so that the ends thereof contact and surrdund the smaller tubular member at an acute angle thereto, and means for securing the ends of said fingers in said position.

In testimony whereof, I have hereunto affixed my signature.

HERBERT P. RENWICK. 

